Method of forming openings for washout-plugs for boilers.



H. B. AYERS.

I METHOD OF FORMING OPENINGS FOR WASHOUT PLUGS FOB, BOILERS. APPLICATION rum) JUNE 29, 1908.

I 927,473. Patented July 13, 1909.

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METHOD OF FORMING OPENINGS FOR WASHOUT-PLUGS FOB BOILERS.

Specification of Letters Patent.

Yatented July 13, 1909.

Application filed June 29, 1908. Serial No. 441,046.

T 0 all whom it may concern:

Be it known that I, HOBART B. AYERS, a resident of Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Methods of Forming Openings for 'Washout- Plugs for Boilers; and I do hereby declare the following to be a full, clear, and exact description thereof.

My invention relates to the method of forming openings for wash-out plugs for boilers or for other purposes.

The object of my invention is to provide a method of forming such openings by which the number of threads may be increased and the plug accordingly held more securely in place.

To these ends my invention consists, briefly stated, in forming an opening in the boiler sheet and then upsetting or crowding the metal around said opening by inserting a suitable expanding tool in said opening, whereby the metal is thickened around the periphery of the opening so as to increase the number of threads which may be formed. in the metal.

In the accompanying drawings Figure 1 is a view of a sheet with the initial opening formed therein; Fig. 2 is a view showing the tool enlarging the opening; Fig. 3 shows the opening finished and threaded; Fig. 4 shows a cross section of a suitable expanding tool for carrying out my 1nvent1on; and. Fig. 5 is a view of the finished hole with the plug therein.

Referring to the drawings the numeral 2 designates a boiler-plate or sheet of suitable thickness. An opening 3 is first drilled or punched in said sheet, said opening being formed of a suitable diameter to receive the expanding tool and provide suflicient metal for up-setting to finally bring the opening to the desired size and yet have suflicient metal to give the increased thickness for the desired number of threads. For the purpose of enlarging or expanding the opening 3 to upset or crowd the metal to the desired thickness I may employ any suitable expanding tool.

The tool 4 illustrated, comprises, generally stated, a central tapering roller 5 with a series of smaller tapering rollers 6 surrounding said central rollers 5, the rollers 6 being secured between the collars 7. As this is a common form of expander I do not deem it necessary to describe the same in further detail. The metal around the opening is first heated and the expanding tool is then inserted and rotated by suitable power, said tool gradually enlarging the o ening and upsetting or crowding the metal so as to form the enlarged or thickened portion 8 around the opening. In this manner the opening is enlarged until it has reached the desired diameter. The upsetting or crowding of the metal in this manner will leave a fin 8, as shown in Fig. 2, which may be ground oil or, if desired, it may be allowed to remain when it will somewhat increase the threading area. It will be observed that the metal is upset in such a manner as to form a boss of equal depth on both sides of the sheet. The threads 10 are then formed in any suitable manner to receive the threaded plug.

By my improved method of forming openings for wash-out plugs I obtain around the periphery of the opening a body of metal which provides increased threading area and consequently greater strength.

What I claim is:

1. The method of forming openings for wash out plugs for boilers or other purposes, consisting in forming an opening in the boiler sheet, and then radially upsetting the metal about said hole to thicken the plate.

2. The method of forming openings for wash out plugs for boilers or other purposes, consisting in forming an opening in the boiler sheet, enlarging said opening by radially upsetting the metal about said hole to form a boss on each side of the sheet.

In testimony whereof, I the said HOBART B. AYERS have hereunto set my hand.

, HOBART B. AYERS.

Witnesses:

ROBERT (J. TOTTEN, J. R. KELLER. 

